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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.config.store;

import static org.junit.Assert.*;

import java.util.concurrent.*;

import org.junit.*;

public class MemoryStoreTest {
	
	@Test
	public void testNoFile() throws Exception {
		ConfigMemoryStore fs = ConfigMemoryStore.create().build();
		assertEquals("", fs.read("X.cfg"));
	}

	@Test
	public void testSimpleCreate() throws Exception {
		ConfigMemoryStore fs = ConfigMemoryStore.create().build();
		assertNull(fs.write("X.cfg", null, "foo"));
		assertEquals("foo", fs.read("X.cfg"));
	}

	@Test
	public void testFailOnMismatch() throws Exception {
		ConfigMemoryStore fs = ConfigMemoryStore.create().build();
		assertNotNull(fs.write("X.cfg", "xxx", "foo"));
		assertEquals("", fs.read("X.cfg"));
		assertNull(fs.write("X.cfg", null, "foo"));
		assertEquals("foo", fs.read("X.cfg"));
		assertNotNull(fs.write("X.cfg", "xxx", "foo"));
		assertEquals("foo", fs.read("X.cfg"));
		assertNull(fs.write("X.cfg", "foo", "bar"));
		assertEquals("bar", fs.read("X.cfg"));
	}
	
	@Test
	public void testUpdate() throws Exception {
		ConfigMemoryStore fs = ConfigMemoryStore.create().build();

		final CountDownLatch latch = new CountDownLatch(2);
		fs.register("X.cfg", new ConfigStoreListener() {
			@Override
			public void onChange(String contents) {
				if ("xxx".equals(contents))
					latch.countDown();
			}
		});
		fs.register("Y.cfg", new ConfigStoreListener() {
			@Override
			public void onChange(String contents) {
				if ("yyy".equals(contents))
					latch.countDown();
			}
		});
		
		fs.update("X.cfg", "xxx");
		fs.update("Y.cfg", "yyy");
		if (! latch.await(10, TimeUnit.SECONDS))
			throw new Exception("CountDownLatch never reached zero.");
	}	
}
